For the colors, it's fun to set it to change the color to something when you push the aswd keys, sniping people gets more colorful.
Also, a very high cg_railTrailTime on, oh, Never Ending Yard. It's really, really cool, but then eventually with 4+ players, you can't see anything.
are you talking here about color in names?
You can use the console, like
\name ^3Bartholemew becomes
Bartholemew.